Boring-machine alarm.



W. POTTER. -BORING MACHINE ALARM; APPLIOATION IILBD snmnzz, 1909.

Patented June 13, 1911.

THE NORRIS PETERS 50., WASHINGTON. n c.

, a h u r. a t r l WILLIAM POTTER, OF NEW YORK, N. Y.

BORING-MACHINE ALARM.

Specification of Letters Patent.

Application filed September 22, 1909.

To all whom it may concern:

Be it known that I, WVILLIAM POTTER, a citizen of the United States of America, and residing at New York, in the county of New Yorkand State of New York, have invented certain new and useful Improvements in Boring-Machine Alarms, of which the following is a specification, such as will enable those skilled in the art to which it appertains to make and use the same.

The object of this invention is to provide an alarm device for boring and drilling machines, whereby an operator is audibly notified when the boring has reached a predetermined depth; a further object being to provide a device of this class which is readily adaptable to boring machines of various kinds and classes; a further object being to provide means for use in connect-ion with the ordinary carpenters bits, of any size.

A further object is to provide such a device which is readily adjustable in the usual manner, and also in slightly appreciable degree by the mere rotation of an element thereof; and a still further object being to provide such a device which is very simple in construction and use, and which is very inexpensive.

My invention is fully described in the fol lowing specification, of which the accompanying drawings form a part, in which the separate parts thereof are designated by the same reference characters in each of the views, and in which Figure 1 is a view of a bit with my invention in operative position, partially in section; Fig. 2 is a section on the line 22 o Fig. 1; and Fig. 3 is a section on the line 33 ofFig. 1.

In the drawings forming a part of this application, I have shown a bit a of the usual type, adapted to be driven into a section 5 of wood and the like, said section being adapted to be touched by the lower end of a flexible rod 0 connected to the bit by means of aclamp d, formed of a bottom plate having angular extensions 0Z so formed as to approximately fit the bit, as shown. Registering with the plate (Z is a similar plate e provided with angular extensions 6 also formed to engage the bit a upon the shank a thereof, said bit being also provided, as shown, with a tang a The plates (Z and e are held together by means of a bolt Patented June 13,- 1911.

Serial No. 518,994. I

f provided with a head f and with a thumbnut f and, in practice, I also prefer to employ a coil spring to separate the said plates when the thumb-nut is released.

The extensions d are provided with holes 0 therethrough for the rod 0 and in which position it is held by means of the portion 6 of the extensions 6 said rod 0 being formed of wire spirally coiled whereby it is made flexible and, at the same time, is more readily engaged by the members (Z and 6 than if smooth, and it will be seen that rotation of the rod 0 will adjust the same, in slight degree, in the clamp although, if a considerable adjustment is desired, the thumb-nut may be loosened and the rod 0 moved longitudinally thereof within the said clamp, gr the clamp and rod may be moved on the it a.

When, in the process of boring, a depth corresponding to the adjustment of the rod 0 has been reached, the end of the said rod engages the material being bored and notifies the person using the device that the limit has been reached, either by the sense of feeling or by making the fact audible to him by the rod end springing from the material at an edge thereof, thereby giving a whirring sound, and it will be understood that the said rod 0 is made sufliciently flexible so as not to injure the material being bored or drilled.

It will, therefore, be seen that I provide an alarm acting both upon the senses of touch and hearing; which is readily adjusted in the clamp by being slid therein or by rotation therein, and I also provide a clamp which is readily adjustable on a bit, and which clamps both the bit and rod by means of the same elements operable from one point, but my invention consists, primarily, of a rod formed of wire spirally wound in order to give a desired flexibility, produce the desired alarm, and be inexpensive in manufacture.

It will be obvious that many changes in and modifications of the construction shown and described may be made within the scope of the following claimsand,

Having now fully described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a boring machine, an alarm, comprising a flexible rod formed of wire spirally Wound, and means for connecting thesame my invention I have signed my name in with said machine. presence of the subscribing Witnesses this 2. In a boring machine, an alarm, com- 18th day of September 1909. prising a flexible rod formed of Wire spirally WILLIAM POTTER. 5 Wound, and means for adjustably oonnect- Vitnesses: ing the same With said machine. GEORGE F. BENTLEY, a

In testimony that I claim the foregoing as J. C. LARSEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

